Gamma-Ray Induced Photocurrent and Readout Noise for BTL LYSO+SiPM Adi Bornheim, Chen Hu , Nan Lu, Maria Spiropulu, Jason Trevor, Liyuan Zhang and Ren-Yuan Zhu California Institute of Technology October 1, 2019 Presented in the CMS MTD Barrel Sensor Meeting at CERN
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Gamma-Ray Induced Photocurrent and Readout Noise
for BTL LYSO+SiPM
Adi Bornheim, Chen Hu, Nan Lu, Maria Spiropulu, Jason Trevor, Liyuan Zhang and Ren-Yuan Zhu
California Institute of TechnologyOctober 1, 2019
Presented in the CMS MTD Barrel Sensor Meeting at CERN
Introduction
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A Question from the Fermilab Director’s Review“Effect on time resolution related to the instantaneous TID (rad/hour). From your 25 kGy after 10 years, we can derive 2.5 kGy per year i.e., 0.5 Gy/hour (50 rad/hour). Measurement of assembled BTL with MIP during irradiation should be performed before going to further. The noise induced from the scintillating tile can deteriorate the timing resolution.”
Plan: Experiments of Two Types Measurements for BTL sensors from selected vendors under the
expected dose rate and the expected hadron flux: Radiation induced photocurrent and readout noise (RIN) measurements, following R. Maoet al., Paper N32-4 and N32-5, IEEE NSS Conference Record (2009). Coincidence timing resolution (CTR) will also be measured.
One total ionization dose (TID:ɣ) and two total neutron/proton fluence (TF:n/p) experiments.
Reported today is the RIN:ɣ dataResults for RIN:n, CTR:ɣ and CTR:n will follow soon
Radiation Expected by CMS BTL MTD TDR: assuming 5×1034 cm-2s-1, 3,000 fb-1 & a safety factor of 1.5
Radiation spec: λin<3 m-1 for 4.8 Mrad, 2.5 x 1013 p/cm2 & 2.9 x 1014 neq/cm2
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10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
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Photocurrent: CPI and SICConsist photocurrent and after glow observed
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
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Photocurrent: Tinle-1 & -2
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
Consist photocurrent and after glow observed
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Gamma-Ray Induced Noise
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
Dose rates at each position determined from a combined fit.
Good linearity observed for all
samples.
F values obtained from linear fits are larger for LYSO with
higher LO.
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Correlations: F values vs. LO
Excellent correlation
shows that the observed
photocurrent is entirely due to
scintillation light
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
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Hamamatsu SiPM s14160-3015ps @ -40 V with a gain of 2×105. LYSO surrounded by a Teflon block and coupled to SiPM with an air gap was Irradiation @ 120, 185 and 250 rad/h. LO in 200 ns gate.
Negligible readout noise at 35 keV as compared to 4.2 MeV MIP signal.
Gamma-Ray Induced Noise
* Corrected by PDE/QE, wrapping and geometry
CrystalID
Corrected SiPM L.O. (p.e./MeV)*
Dose rate (rad/h)
Dark cur. before irrad.
(nA)Photo cur.
(µA)Dark cur. 20s after irrad.
(nA)F
(p.e./s/rad/hr)σ
(keV)
CPI-12 1609120 81 296 108
7.19×107 33.3185 87 411 108250 107 561 159
SIC-5 1619120 27 259 125
7.01×107 32.7185 103 429 288250 230 565 460
Tianle-2 1336120 28 221 177
5.65×107 35.6185 50 328 273250 102 452 330
Tianle-20 1483120 27 246 101
6.38×107 34.1185 45 388 153250 71 497 191
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
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Correlation: Dark Currents before vs. after
Good correlation shows that
the dark current is
affected by the afterglow
after irradiation
10/1/2019 Presented by Chen Hu in the CMS MTD Barrel Sensor Meeting
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SummaryAn RIN:ɣ experiment was carried out for LYSO samples surrounded by a Teflon block and coupled to SiPMs with an air gap. Four LYSO samples from three vendors were tested under three dose rates. While these LYSO samples are not identical, the RIN:ɣ values show a consistent noise level at about thirtyish keV, which is negligible as compared to the 4.2 MeV MIP signal.A new pair of Cf-252 sources is being added to the existing two pairs. An RIN:n experiment will be carried out in October.CTR:ɣ and CTR:n experiments will be carried out in Fall. A TID:ɣ experiment is also planned in Fall. Depending on a crane reparation, a TF:n experiment may start at LANSCE in Fall, 2019.